21924120 has 32 divisors (see below), whose sum is σ = 65772720. Its totient is φ = 5846400.

The previous prime is 21924113. The next prime is 21924127. The reversal of 21924120 is 2142912.

It is an interprime number because it is at equal distance from previous prime (21924113) and next prime (21924127).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21924127) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 91231 + ... + 91470.

Almost surely, 2^21924120 is an apocalyptic number.

21924120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21924120 is an abundant number, since it is smaller than the sum of its proper divisors (43848600).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21924120 is a wasteful number, since it uses less digits than its factorization.

21924120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182715 (or 182711 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 21924120 is about 4682.3199378086. The cubic root of 21924120 is about 279.8814123670.

The spelling of 21924120 in words is "twenty-one million, nine hundred twenty-four thousand, one hundred twenty".